Process for separating HCl and halocarbons
AssigneeE. I. Du Pont de Nemours and Company
InventorsBarry A. Mahler, Vinci M. Felix, Ralph N. Miller
Life of this patent
Estimating the term…
Abstract
The present invention discloses an extractive distillation process for separating HCl from pentafluoroethane, chloropentafluoroethane, chlorotrifluoroethane, trifluoromethane, and other fully saturated and unsaturated fluorocarbons, chlorofluorocarbons and chlorocarbons.
Claims16
A process for separating HCl from a first mixture comprising HCl and at least one halocarbon selected from the group consisting of pentafluoroethane, chlorotrifluoromethane, trifluoromethane and chloropentafluoroethane;
- the process comprising the steps of:
- adding a fluorocarbon, chlorofluorocarbon or chlorocarbon extractive agent having 1 to 5 carbon atoms, either saturated or unsaturated, optionally including hydrogen, and having a boiling point at atmospheric pressure greater than about -48.degree. C. and less than about 120.degree. C., to the first mixture in order to form a resultant second mixture, and;
- separating HCl from the halocarbon of the second mixture by extractively distilling the second mixture in an extractive distillation zone and thereby recovering HCl substantially free of halocarbon.
A process for separating HCl from a first mixture comprising HCl and at least one halocarbon selected from the group consisting of saturated fluorocarbons, saturated and unsaturated chlorofluorocarbons, saturated and unsaturated hydrofluorocarbons, saturated and unsaturated hydrochlorocarbons, saturated and unsaturated hydrochlorofluorocarbons, saturated and unsaturated chlorocarbons;
- the process comprising the steps of:
- adding a fluorocarbon, chlorofluorocarbon or chlorocarbon extractive agent having 1 to 5 carbon atoms, either saturated or unsaturated, optionally including hydrogen, and having a boiling point at atmospheric pressure greater than about -48.degree. C. and less than about 120.degree. C., to the first mixture in order to form a resultant second mixture, and;
- separating HCl from the halocarbons of the second mixture by extractively distilling the second mixture in an extractive distillation zone and thereby recovering HCl substantially free of the halocarbons.
A process for separating HCl from a first mixture comprising HCl and at least one halocarbon selected from the group consisting of saturated fluorocarbons, saturated and unsaturated chlorofluorocarbons, saturated and unsaturated hydrofluorocarbons, saturated and unsaturated hydrochlorocarbons, saturated and unsaturated hydrochlorofluorocarbons, saturated and unsaturated chlorocarbons;
- the process comprising the steps of:
- adding an extractive agent comprising at least one saturated or unsaturated C1 to C5 compound to the first mixture in order to form a resultant second mixture, and;
- separating HCl from the halocarbons of the second mixture by extractively distilling the second mixture in an extractive distillation zone and thereby recovering HCl.
Dependencies are inferred from the claim text.